4 results about "Expansive clay" patented technology

The invention discloses a ground grouting reinforcement method for an unfavorable geological section of a subway tunnel section. By comprehensively investigating rock and soil characteristics, underground water level, underground water permeability coefficient and unfavorable geological section depth, grouting hole distribution and hole depth are designed according to different geological conditions, and grouting liquid containing specific proportion components is prepared for sandy soil, clay and rock. And according to the rock-soil type, the single-hole grouting amount, the grouting pressure and the grouting speed are reasonably set, the effect is evaluated through multiple detection means such as geological radar scanning, and grouting is supplemented for the substandard area. For special unfavorable geology, such as a flowing sand layer, expansive clay, a fault fracture zone and the like, corresponding auxiliary measures and grouting modes are adopted. According to the method, the pertinence, scientificity and adaptability of grouting reinforcement are effectively improved, the safety and long-term stable operation of tunnel construction are guaranteed, the engineering cost is reduced, and the reinforcement accuracy and reliability are improved.

The invention relates to a humidity-controlled XRD (X-Ray Diffraction) test system and a humidity-controlled XRD test method for expansive clay minerals. The testing system comprises a sample chamber, a gas circulating pump, a saturated solution bottle and a gas transition bottle. And saturated salt solutions or water corresponding to different relative humidity are filled in the saturated solution bottle. The testing method comprises the following steps: preparing the expansive clay mineral oriented sheet; placing the expansive clay mineral oriented sheet in a sample chamber, and sealing the sample chamber; building a test system, and selecting a saturated salt solution or water under the corresponding relative humidity; and after the relative humidity in the sample chamber is balanced, carrying out XRD test on the expansive clay mineral oriented sheet. Compared with the prior art, the XRD test under different humidity conditions can be carried out on a high-purity and high-orientation expansible clay mineral oriented sheet sample, so that relevant parameters of a crystal layer expansion process are further obtained.

The present application relates to the technical field of geothermal resource development and utilization, in particular to a Guantao group geothermal recharge well gel pretreatment agent, by weight percentage, comprising: citric acid: 10%-30%; organic acid: 2%-5%; corrosion inhibitor: 1%-4%; chelating agent: 0.1%-2%; iron ion stabilizer: 1%-4%; clay stabilizer: 1%-2%; anti-swelling agent: 1%-4%; calcium gluconate: 0.2%-0.4%; ferrous gluconate: 0.2%-0.4% and the rest is water. The present application does not use strong acid, strong base and strong oxidizing agent, ensuring construction safety. The system selects raw materials with the same composition as the formation water, can achieve no residue, remove the blockage of chemical agents in the oil and gas production process, reduce the seepage pressure, increase the water yield of geothermal well and recharge. Not only can prevent clay swelling, but also can realize the shrinkage of expanded clay, thereby reducing the migration of fine particles and having a certain sand prevention effect.

An aqueous barrier coating for a paper product can include a chemically unmodified expansive clay dispersed in a binder, where the expansive clay is dispersed under high shear conditions such that the expansive clay is present in the form of crystalloid agglomerates.